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High frequency receiving apparatus

High frequency receiving apparatus description/claims

This nonprovisional application is based on Japanese Patent Application No. 2007-138257 filed with the Japan Patent Office on May 24, 2007, the entire contents of which are hereby incorporated by reference.

1. Field of the Invention

The present invention relates to a high frequency receiving apparatus, and in particular to a hybrid high frequency receiving apparatus capable of receiving both terrestrial broadcast waves and satellite broadcast waves.

2. Description of the Background Art

A high frequency receiving apparatus is used to receive terrestrial broadcast and satellite broadcast. As an example of such a high frequency receiving apparatus, a tuner will be described. As shown in FIG. 7, in a conventional tuner 130, a motherboard 119 is placed within a cabinet 120, and a high frequency receiver main body 140, a terrestrial broadcast distributor unit 113, a satellite broadcast distributor unit 114, a microcomputer 116, a signal processing circuit 117, a power supply circuit 118, and the like are mounted on motherboard 119 at respective predetermined positions.

As shown in FIG. 8, in high frequency receiver main body 140, a shield case 109 is provided therein with filter circuits 104a and 104b, AGC (Automatic Gain Control) amplification circuits 105a and 105b, mixers 106a and 106b, local oscillation circuits 108a and 108b, and demodulation circuits 115a and 115b identified as circuit blocks, and seated with a shield lid 110 (see FIG. 7). These filter circuits 104a and 104b and the like are provided in two sets, for an RF (Radio Frequency) signal for terrestrial broadcast and an RF signal for satellite broadcast.

The inside of shield case 109 is partitioned by a partition member 141, corresponding to the circuit blocks, Filter circuits 104a and 104b and the like are placed in predetermined regions partitioned by partition member 141.

Next, a function of tuner 130 will be described. Firstly, an RF signal for terrestrial broadcast and an RF signal for satellite broadcast output from terrestrial broadcast distributor unit 113 and satellite broadcast distributor unit 114 are input to input connectors 101a and 101b, respectively. The RF signal for terrestrial broadcast input to input connector 101a is processed in each of the circuit blocks including AGC amplification circuit 105a, filter circuit 104a, mixer 106a, local oscillation circuit 108a, and demodulation circuit 115a.

The RF signal for satellite broadcast input to input connector 101b is also processed in each of the circuit blocks including AGC amplification circuit 105b, filter circuit 104b, mixer 106b, local oscillation circuit 108b, and demodulation circuit 115b. The respective processed RF signals are output to signal processing circuit 117 as demodulation signals.

On this occasion, a harmonic wave of the RF signal for terrestrial broadcast may overlap and interference with each of the RF signal and a local oscillation signal for satellite broadcast. Further, a harmonic wave of a local oscillation signal for terrestrial broadcast may overlap and interference with each of the RF signal and the local oscillation signal for satellite broadcast. Therefore, to prevent such interference, the signals are electrically isolated by partitioning the inside of shield case 109 with partition member 141, corresponding to the circuit blocks. Tuner 130 is disclosed for example in Japanese Registered Utility Model No. 3096172.

However, a tuner as a conventional high frequency receiving apparatus has a problem described below. Recently, thinner and smaller-sized television receivers, DVD (Digital Versatile Disc) recorders, or the like are in demand, and price reduction is also being pursued. Accordingly, to respond to these demands, a thinner or smaller-sized tuner is also in demand.

As shown in FIG. 7, tuner 130 described above includes high frequency receiver main bodies 140 each receiving and processing the two RF signals for terrestrial broadcast and satellite broadcast, and accordingly two sets of RF distributor units 113 and 114 are required. Therefore, a space for placing two high frequency receiver main bodies 140 and two RF distributor units 113 and 114, that is, a total of four units, should be secured within cabinet 120 of tuner 130, which has been one of the factors inhibiting size reduction and the like. Further, an operation for mounting these units on motherboard 119 is also required, which has been one of the factors raising the cost and inhibiting price reduction.

The present invention has been made to solve the aforementioned problems, and one object of the invention is to provide a high frequency receiving apparatus that is reduced in size and contributes to price reduction.

A high frequency receiving apparatus in accordance with the present invention is a high frequency receiving apparatus receiving terrestrial broadcast and satellite broadcast, including a predetermined casing, a first distributor, a second distributor, a first circuit portion, a second circuit portion, a first output terminal, and a second output terminal. The first distributor is provided within the casing for distributing an input first signal for terrestrial broadcast. The second distributor is provided within the casing for distributing an input second signal for satellite broadcast. The first circuit portion is provided within the casing for processing the first signal distributed by the first distributor and outputting the first signal as a demodulation signal. The second circuit portion is provided within the casing for processing the second signal distributed by the second distributor and outputting the second signal as a demodulation signal. The first output terminal is placed on the casing for outputting the first signal distributed by the first distributor. The second output terminal is placed on the casing for outputting the second signal distributed by the second distributor.

With this configuration, in addition to the first circuit portion processing the first signal for terrestrial broadcast and the second circuit portion processing the second signal for satellite broadcast, the first distributor distributing the first signal and the second distributor distributing the second signal are provided within the casing serving as a high frequency receiver main body. Thereby, the first distributor and the second distributor are accommodated within the high frequency receiver main body, and thus saving in space and reduction in the number of man-hours for mounting can be achieved, when compared to a case where the first distributor and the second distributor are provided separately from the casing. As a result, the high frequency receiving apparatus can be reduced in size, and can contribute to price reduction.

More specifically, preferably, the high frequency receiving apparatus includes a board on which the first distributor, the second distributor, the first circuit portion, and the second circuit portion are mounted, and the casing includes a shield case with a bottom accommodating the board, and a shield lid closing the shield case.

As to the positions of the first output terminal and the second output terminal, they are preferably placed on side surface portions of the shield case. They may also be placed on the shield lid.

As the first output terminal and the second output terminal, a predetermined jack is preferable. Preferably, such a jack is placed within the shield case, and the shield lid is provided with an insertion hole for a predetermined plug to be connected to the jack.

As the jack and the plug, an F-type jack and an F-type plug, an RCA pin jack and an RCA pin plug, or an SMB jack and an SMB plug can be employed.

Preferably, the high frequency receiving apparatus includes a guide portion provided around the insertion hole for guiding the plug to the jack, for easy connection of the plug to the jack.

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

• Provisional Patent
• Utility Patent

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